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Astronaut Sunita Williams experiences 16 sunrises and sunsets daily aboard the International Space Station (ISS) due to its rapid 90-minute orbit around Earth. At speeds of 28,000 km/h, the ISS completes a full cycle every 45 minutes. Astronauts follow a strict schedule based on UTC to manage their work, rest, and health, as there are no natural day-night cues in space.
